Buzz
Formula for calculating the area of a circle: S = πR2 (The area of a circle is the constant Pi multiplied by the square of its radius, measured in square meters)
Where π is a constant (π = 3.14), the ratio of the circumference of a circle to its diameter.
R is the radius of the circle.
Below are some problems applying the method of calculating the area of a circle for your practice in memorizing the formula.
Problem 1: Calculate the area of a circle with a radius R = 10 cm.
Solution: Applying the formula for calculating the area of a circle, we get: S = πR2 =3.14 x 102 = 314 cm2
Answer: 314 cm2
Problem 2: Calculate the area of a circle knowing its circumference is 6.28 m2.
Solution:
The problem states that the circumference of the circle is 6.28 m2 = 628 cm2 and requests the calculation of the area.
Firstly, we need to find the radius of the circle based on the formula for calculating the circumference of a circle:
C = 2πR => R = C: 2π = 628 : (2 x 3.14) = 100 cm (The circle has a radius of 1m)
Applying the formula for the area of a circle: A = πR2 =3.14 x 1002 = 3.14 x 10000 = 31400 cm2
Answer: 31400 cm2 or 314 m2
Calculating the area of a circle is quite straightforward. I hope this article and illustrative example help you reinforce your knowledge and apply it to circle area problems easily.
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Calculating the area of a rectangle, square, and more is also updated by Mytour.vn. You can refer to it to enhance and effectively enrich your knowledge.
